There's been a lot of comments on this on here and Twitter, in a 'lol that's classic Poch' as if it's something wrong with him.
I look at it like this - he is one of the most obsessed coaches around about physical condition. He is obsessed with data. Everything he does with regards to conditioning is probably something he has applied the most thought to.
I think he likes to get minutes into players, and likes to build their endurance. I think if a player needs rest, they get rest and don't play, but I don't think it's very common that key players get 'rested' and subbed off after 65 mins for arguments sake. I don't think Poch thinks about it like that. I think he likes the key players to in a peak condition, and I don't think there has ever been a point where our key players have been seriously underwhelming as the season progresses. They all seem to get better. I don't have the precise data to answer it properly, but we just have to trust him. It's all about leading to performances across the season, and building endurance and flow. He rests more for injury prevention, but plays more for form. Think of it that way.
A lot of our system is based on being physically better than the opposition, particularly as the season progresses. We withstand more than others and we run more. To do that well the players need minutes. If you think back to previous seasons, he has played Eriksen and Dele in early League Cup rounds against lower league opposition because they needed minutes. He doesn't think about it like rest, unless they are close to an injury. Remember how early season everyone says Kane looks tired, and then all of sudden he goes on a run? I swear it's happened every year since his second first team season. It isn't rest he needed, it's minutes.
I think 16/17, we peaked perfectly towards the end, and were so unlucky that Chelsea went on a ridiculous run earlier on in the season. Last season, I think we peaked too early (likely because of more intensity / tempo given in the CL group stages) and this season he is clearly trying to manage the entire squad so we can last the course. I also think he knows about individual players to the point where he knows where their breaking points are. I think Kane can handle more than most, and I think Dele often gets subbed on 85 mins if he's started. There are small adjustments, but generally it's about getting the minutes into the players so they can hit peak condition at the business end of the season.
I think giving players a rest because we are 3 goals up is very much a Harry Redknapp style 'think about winning the game today' kind of thing where as Poch is more a 'lets think about how we manage ourselves across the season' and he doesn't let individual circumstance deviate himself too much from the plan, and that's why our form is generally consistent and predictable.